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http://sources.redhat.com/ml/newlib/2002/msg00230.html Stephen L Moshier wrote: > > pow(x,y) returns 0 when x is very close to -1.0 and y is very large. > The following test program prints > > pow(1.0000000000000002e+00 4.5035996273704970e+15) = 2.7182818284590455e+00 > pow(-1.0000000000000002e+00 4.5035996273704970e+15) =0.0000000000000000e+00 > pow(9.9999999999999978e-01 4.5035996273704970e+15) = 3.6787944117144222e-01 > pow(-9.9999999999999978e-01 4.5035996273704970e+15) = 0.0000000000000000e+00 > > which is incorrect for the negative arguments raised to an odd integer > power. > > ----- > double pow (double, double); > > int > main () > { > double x, y, z; > > x = 1.0 + pow (2.0, -52.0); > y = 1.0 + pow (2.0, 52.0); > z = pow (x, y); > printf ("pow(%.16e %.16e) = %.16e\n", x, y, z); > x = -x; > z = pow (x, y); > printf ("pow(%.16e %.16e) = %.16e\n", x, y, z); > x = 1.0 - pow (2.0, -52.0); > z = pow (x, y); > printf ("pow(%.16e %.16e) = %.16e\n", x, y, z); > x = -x; > z = pow (x, y); > printf ("pow(%.16e %.16e) = %.16e\n", x, y, z); > } > ----- > > Here is a patch for newlib/libm/math/epow.c: Patch checked in and duplicated for ef_pow.c. Thanks. -- Jeff J.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 15 Sep 2008 04:31:30 +0000
parents c6a447c98584
children
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<!DOCTYPE HTML PUBLIC "-//Norman Walsh//DTD DocBook HTML 1.0//EN">
<HTML>
<HEAD><TITLE>Simple DirectMedia Layer Introduction</TITLE></HEAD>
<BODY BGCOLOR="#FFF8DC" TEXT="#000000" LINK="#0000ee" VLINK="#551a8b" ALINK="#ff0000">
<DIV CLASS="NAVHEADER">
<HR ALIGN="LEFT" WIDTH="100%">
</DIV>
<DIV CLASS="PREFACE">
<H2><A NAME="AEN8">Simple DirectMedia Layer Introduction</A></H2>
<P>
This library is designed to make it easy to write games that run on many
different platforms using the various native high-performance media interfaces,
(for video, audio, etc) and presenting a single source-code level API to
your application.  This is a fairly low level API, but using this, completely
portable applications can be written with a great deal of flexibility.
</P><P>
An introduction to SDL can be found online at:
<A HREF="http://www.libsdl.org/intro.php" TARGET="_top">
         http://www.libsdl.org/intro.php</A>
</P><P>
Tutorials on a variety of topics can be found online at:
<A HREF="http://www.libsdl.org/tutorials.php" TARGET="_top">
         http://www.libsdl.org/tutorials.php</A>
</P><P>
Documentation in Wiki form can be found online at:
<A HREF="http://www.libsdl.org/cgi/docwiki.cgi/" TARGET="_top">
         http://www.libsdl.org/cgi/docwiki.cgi/</A>
</P><P>
Enjoy!
</P><P>
&nbsp;&nbsp;&nbsp; Sam Lantinga
<TT CLASS="EMAIL">&#60;<A HREF="mailto:slouken@libsdl.org"><A HREF="mailto:slouken@libsdl.org" TARGET="_top" >slouken@libsdl.org</A></A>&#62;</TT>
</P> <P>
<br><br><HR>
<H1>Table of Contents</H1>
<UL>
<LI><A HREF="html/index.html">Full Table of Contents</A></LI>
<LI><A HREF="html/guide.html">The SDL Guide</A></LI>
<LI><A HREF="html/reference.html">The SDL Reference</A></LI>
<UL>
<LI><A HREF="html/general.html">Initialization</A></LI>
<LI><A HREF="html/video.html">Video</A></LI>
<LI><A HREF="html/wm.html">Window Manager</A></LI>
<LI><A HREF="html/event.html">Event Handling</A></LI>
<LI><A HREF="html/joystick.html">Joystick</A></LI>
<LI><A HREF="html/audio.html">Audio</A></LI>
<LI><A HREF="html/cdrom.html">CDROM</A></LI>
<LI><A HREF="html/thread.html">Threads</A></LI>
<LI><A HREF="html/time.html">Timers</A></LI>
</UL>
</UL>
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